WO1997038277A1

WO1997038277A1 - Aeration type rotary drying machine

Info

Publication number: WO1997038277A1
Application number: PCT/JP1996/000958
Authority: WO
Inventors: Yukio Yamato
Original assignee: Yamato Sanko Mfg. Co., Ltd.
Priority date: 1996-04-08
Filing date: 1996-04-08
Publication date: 1997-10-16
Also published as: DE69617949D1; CA2221412C; EP0831287A1; EP0831287B1; AU709946B2; EP0831287A4; JP3063163B2; KR19990014849A; CA2221412A1; DE69617949T2; US5996245A; AU5163096A

Abstract

An aeration type rotary drying machine is adapted to blow the air into a material layer in a cylinder or blow the air upon the surface of a material layer. The air flows through an air pipe (21) extending from an outlet box (12) through a rotating cylinder (10) in the axial direction thereof to an inlet box (11). The air pipe (21) comprises a plurality of axially connected main pipe members (22, 23, 24) provided in the cylinder (10), the diameters of the main pipe members being set gradually smaller starting at the outlet side toward the inlet side. Since the diameter of the main pipe member (24) closest to the inlet is smallest, the diameter of an opening (32) of an inlet side partition plate (31) of the cylinder (10) can also be set small. Since the radial width of the inlet side partition plate (31) can therefore be set large, the overflowing of fed raw material from the inlet side opening (32) can be prevented. Since the diameter of the main pipe member (22) passing through an opening (34) of an outlet side partition plate (33) is the largest, an available clearance of the outlet side opening (34) becomes smaller. However, the outlet side partition plate (33) comprises louvers (35) as necessary which are arranged in a circumferentially spaced manner, so that the discharging of the air is done not only from the available clearance of the opening (34) but also from the clearance between the louvers (35). This enables the discharged air volume to increase, and the capacity not less than two times as large as that of a general rotary drying machine having a cylinder of the same volume to be secured.

Description

Description Ventilated tumble dryer Technical field

According to the present invention, a main pipe is inserted into a rotating cylinder in the axial direction, a plurality of branch pipes are branched from the main pipe, and the pipe ends are opened inside the processing material layer in the circle or with respect to the surface thereof. Also, the present invention relates to an improvement of a ventilation rotary dryer in which heated air is fed into a main pipe and injected from a pipe end of a branch pipe to increase a contact effect between the heated air and a processing raw material. Background art

A conventional through-air dryer is known from U.S. Pat. No. 4,656,759. The rotary dryer is provided with an inlet box and an outlet box, a cylinder rotatably and airtightly supported between the inlet and outlet boxes, a means for rotating and driving the cylinder, and an inlet box. Raw material injection means, a main pipe of the same diameter that protrudes axially into the cylinder through the inlet box, a hot air source that supplies heated air to the main pipe, and a pipe that branches off from the main pipe in the radial direction. It had a number of branch pipes whose ends were opened in the processing material layer in the cylinder, and exhaust means and processing material discharging means provided in the outlet box. Both end surfaces of the rotary cylinder are formed of hollow disk-shaped partition plates, and the shot of the raw material charging means and the main pipe for heated air enter the cylinder from the opening of the inlet-side partition plate. Exhaust and processed raw materials are discharged to the outlet robot through the opening of the outlet-side partition plate.

The raw materials at the beginning of loading contain a lot of water. Radial direction of raw material layer in cylinder When the depth of the plate becomes larger than the radial width of the plate on the inlet side, the raw material overflows into the inlet box. Therefore, the input amount of raw material per hour is defined by the width of the entrance-side partition plate in the radial direction. Since the conventional aeration dryer supplies heated air from the inlet side, the opening of the inlet-side partition plate has a relatively large diameter to allow the passage of a thick main pipe for heated air and a raw material shot. Was. There was a limit to increasing the width of the partition plate in the radial direction in accordance with the increasing raw material input.

The processed raw material moves over the exit side hollow disk to the exit box, and the air in the circle is exhausted from the opening of the exit side partition plate. In order to increase the processing capacity of the dryer, the displacement of the air inside the cylinder must be increased, but the displacement is determined by the opening area of the outlet-side partition plate. If the outlet-side partition plate opening is made larger in diameter and the radial width of the partition plate is reduced to increase the displacement, the raw material can easily pass through the outlet-side partition plate, reducing the raw material holding rate. Insufficient processing of raw materials. Also, if there are lumps in the raw material, the raw material becomes difficult to climb over the exit-side partition plate, and there is a possibility that the discharge of the raw material may be hindered.

In this type of dryer, the end of the branch pipe is extended to the inside of the raw material layer or close to the surface * in order to sufficiently contact the heated air with the raw material, and the heated air is injected from the end of the pipe, but it is generated in the cylinder The center angle position of the laminar flow of the raw material varies depending on the properties and rotation speed of the raw material, but the conventional dryer could not adjust the radiation angle of the branch pipe, so the position where the pipe end is always processed in the optimum state It was not always.

The present invention has been made in order to solve the above-mentioned drawbacks, and one of the objects is to provide a ventilated rotary machine capable of reducing the inner diameter of the inlet-side partition plate and increasing the amount of raw material charged. It is to provide a dryer.

Two of the purposes are to increase the inside diameter of the outlet side partition plate without increasing the inner diameter. It is an object of the present invention to provide a ventilated tumble dryer capable of increasing air displacement.

The third object of the present invention is to provide a ventilated rotary dryer that can discharge lumps of raw materials without any problem.

The purpose 4 is to provide a ventilation type rotary dryer in which the upstream of the air main pipe is made thicker and the downstream is made thinner without adjusting the air blow main pipe to the same diameter, and the amount of air is adjusted according to the amount of air blown into the branch pipe. To provide. Disclosure of the invention

The present invention provides an inlet box, an outlet box, a cylinder rotatably and airtightly supported by the inlet and outlet boxes, a means for driving the cylinder to rotate, a raw material charging means provided in the inlet box, An air main pipe that passes through the inside of the cylinder in the axial direction; a blower that supplies air to the main pipe; and a radial branch from the main pipe, with a pipe end opening inside or on the surface of the processing material layer inside the cylinder. The main pipe is inserted into the rotary cylinder from the outlet box side in a ventilated rotary drier provided with a large number of branch pipes provided so as to perform, exhaust means provided in the outlet box, and processing material discharge means. The main pipe is formed of a plurality of main pipes connected in a longitudinal direction, and the diameter of the main pipe is set so that the outlet box side is thick and the inlet box side is thin. As a result, the amount of air ejected from the branch pipe is distributed rationally. Also, since the diameter of the main air pipe passing through the opening of the inlet-side partition plate of the rotating cylinder becomes smaller, the inside diameter of the opening of the inlet-side partition plate becomes smaller by that amount, and the radial width of the hollow plate portion of the partition plate Can be increased. As a result, it is possible to increase the raw material holding ratio of the cylinder and increase the raw material input amount.

In addition to the air main pipe, the raw material feeding device's shut or conveyor also passes through the circular opening in the inlet-side partition plate, so if necessary, set the axis of the air main pipe in the circular opening. Eccentrically off-center to make the diameter of the circular opening smaller.

It is desirable that the plurality of main pipes be connected to each other through a flange, and that the bolt holes of one or both flanges be oblong so that their angular positions with respect to their respective axes can be adjusted. This makes it possible to adjust the central angle of the branch pipe radially branched from the main pipe. Therefore, depending on the raw material, by setting the branch direction of the branch pipe according to the center position of the raw material layer in the pipe, the pipe end of the branch pipe is always positioned at the center of the raw material calendar, and the processing is performed in an optimal state It becomes possible.

Furthermore, the present invention provides the rotary dryer, wherein the hollow circular plate portion of the cylindrical outlet box-side partition plate is formed of a plurality of levers arranged in parallel in a circumferential direction, and each looper is provided outside the cylindrical axial direction. Tilt the end so that it advances in the cylinder rotation direction with respect to the inner end. Since the inclined louver attempts to reverse the flow of the processing material, the processing material in the cylinder does not pass through the space between the louver and the looper in the axial direction, passes over the looper, and is discharged to the outlet box. The air inside flows freely through the space between the louvers in the axial direction to the outlet box. Therefore, even when the opening of the large air main pipe passes through the opening of the partition plate on the side of the cylindrical outlet box, even if the opening of the opening becomes small, the air in the circle can be discharged at a desired displacement.

When processing large bulk or block-shaped raw materials, attach multiple spoon-flighted flights to the inner peripheral surface of the cylinder near the louver, and attach an inclined plate to the exit box or air main pipe to enter the opening of the cylindrical exit partition plate. You. The freight scoops the raw material from the inner bottom of the cylinder and drops it to the top or f. The inclined plate receives the raw material dropped by the freight and discharges it to the outlet box. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a side view showing an external appearance of a ventilation type rotary dryer of the present invention, and FIG. 2 is a side sectional view showing a main part of the dryer of FIG.

FIG. 3 is a view taken along line III-m of FIG.

FIG. 4 is a diagram corresponding to FIG. 3 of another embodiment.

FIG. 5 is a view taken along line VV of FIG.

FIG. 6 is a diagram taken along the line VI-VI of FIG.

FIG. 7 is a side sectional view showing an outlet side of a cylinder according to another embodiment.

FIG. 8 is a view taken in the direction of the arrows in FIG.

FIG. 9 is a diagram corresponding to FIG. 6 of still another embodiment.

FIG. 10 is a view taken in the direction of arrows XX in FIG.

FIG. 11 is a cross-sectional view of a cylinder according to still another embodiment.

FIG. 12 is a cross-sectional view showing opening and closing of the cover of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 shows the overall appearance of a ventilated rotary dryer according to the present invention. Both ends of the circle 10 are fitted into the inlet box 11 and the outlet box 12 in an airtight and rotatable manner. The inlet box 11 and the outlet box 12 are mounted on the base 13 or independently of each other. The inlet box 11 is provided with a raw material input device 14, and the outlet box 12 is provided with a discharge port 15 for discharging the processed raw material and an exhaust port 16. The exhaust port 16 is connected to a dust collector 44. A pair of girth gears 17 and two tires 18 are externally fitted on the outer peripheral surface of the cylinder 10, and the girth gears 17 are engaged with gears of a rotary drive device 19 mounted on the base 13.

The two tires 18 rest on a tire receptacle 20 placed on the base 13. The tire receiving port 20 supports the cylinder 10, and the rotation drive device 19 rotates the cylinder 10 at a predetermined speed. Air pipe 21 extending from blower 45 Passed through the back. The air pipe penetrates the cylinder in the axial direction and reaches the inlet box side. In the case of heating and drying, a heater is attached to the blower 45, but in the case of cooling, the heater may not be provided.

As shown in FIG. 2, the air pipe 21 in the cylinder 10 is composed of several main pipes 22, 23, 24 which are sequentially connected concentrically in the axial direction. The front end main pipe 24 supported on the inlet box 11 side has the smallest diameter, and the rear end main pipe 22 supported on the outlet box 12 side has the largest diameter. Generally, the main pipes are connected via flanges 25 and 26, but they can also be connected by welding. Branch pipes 27 branch from the main pipes 22, 23 and 24 in the radial direction and enter the raw material in the cylinder 10. The pipe end of the branch pipe 27 opens inside or on the surface of the raw material calendar near the inner peripheral surface of the cylinder 10. The inlet-side partition plate μ of the cylinder 10 is provided with a cut 28 of the raw material introduction device 14 or a circular opening 32 through which the main pipe 24 passes through the conveyor. The large-diameter main pipe 22 passes through the circular opening 34 of the exit-side partition plate 33 of the cylinder 10.

As shown in FIG. 3, compared to the conventional drier, the diameter of the main pipe 24 on the inlet side is very small, so even if the outer diameter of the cylinder 10 and the size of the chute 28 or the conveyor are the same. The inner diameter of the opening 32 is smaller than before. As a result, the width of the hollow partition plate 31 in the radial direction becomes larger than that of the conventional one, and the raw material is effectively prevented from overflowing from the opening 32 to the inlet box side.

As shown in Fig. 4, the center of the main pipe 24 on the most inlet side is shifted from the center of the circular opening 32 of the partition plate 31, and the center of the contour where the chute 28 of the raw material charging device and the main pipe 24 are combined is a circular opening. When aligned with the center of 32, the diameter of the opening 32 is minimum and the radial width of the partition plate 31 is maximum. Overflow of the raw material into the inlet box 11 can be more effectively prevented.

As shown in FIG. 5, the angular position of the branch pipe 27 branching from the main pipe 22 with respect to the axis is distributed in several ways. As the cylinder 10 rotates in the direction indicated by the arrow, the surface of the raw material stream is inclined with respect to the horizontal. Drying progresses depending on the raw material Therefore, the friction between the inner surface of the cylinder and the raw material differs, and the inclination angle of the surface of the flow of the raw material changes. Initially, the angle of inclination with respect to the horizon is large, but may decrease gradually. Since the angular positions of the branch pipes 27 are distributed in several ways, the air injected from the pipe ends of the branch pipes 27 is in uniform contact with the raw material and contributes to effective drying. As shown in Fig. 6, the flange 26 of the main pipe 23 is a long hole in which the port hole 37 extends in the circumferential direction. Can be adjusted in the range. If the angular position of the raw material flow in the cylinder with respect to the axial center changes as the material dries, the angular position of the branch pipe with the main pipe is changed along with the raw material flow, and the pipe end of the branch pipe is always kept at the raw material end. It can be adjusted to maintain the optimal position for the flow.

As shown in FIGS. 7 and 8, the hollow circular partition plate 33 on the outlet side of the cylinder 10 is formed from a large number of louvers 35 arranged at regular intervals in the circumferential direction. Each louver 35 is inclined so that the outer end side in the cylindrical axis direction advances in the cylindrical rotation direction with respect to the inner end side. Since the raw material is not discharged in the axial direction from the gap of the louver 35 but is pushed inward in the radial direction, as shown by the arrow A in FIG. 7, the raw material passes through the louver 35 at the lower half of the partition plate 33. Over the opening 34, it is discharged to the exit box 12. However, as shown by arrows B and C, the air is exhausted not only from the opening 34 but also from between the louvers 35 of the partition plate 33. Therefore, even if the large-diameter main pipe 22 passes through the opening 34 of the partition plate 33, air can be exhausted with little resistance. Thus, the outlet-side partition plate 33 composed of the louver 35 acts as a partition plate for the raw material, but has no function as a partition plate for air.

The dryer of the embodiment shown in FIG. 9 and FIG. 10 is used when a raw material which becomes lumpy or blocky is mixed. Such a raw material does not easily pass through the exit-side partition plate 33 of the cylinder 10. Therefore, the exit side partition plate 33 Immediately inside, a plurality of spoon-shaped or box-shaped flyts 36 are mounted on the inner peripheral surface of the cylinder 10 and a support plate 38 attached to the outlet box 12 is attached with a receiving plate 39 inclined into the outlet box. . This backing plate can be attached directly to the main air pipe. The flight 36, which rotates in the direction of arrow D together with the circle 10, scoops up the bulk or block-shaped material that has accumulated at the bottom of the cylinder 10, and drops it onto the receiving plate 39 at the top. The raw material dropped on the receiving plate 39 is discharged to the outlet box 12 by sliding on the receiving plate 39. As a result, raw materials such as lumps that cannot exceed the partition plate 33 can be discharged without any trouble.

In the embodiment shown in FIG. 11, a hinged openable cover 40 is attached to the air main pipe 22, and the cover 40 is opened to remove dust accumulated thereon. The branch pipe 27 is formed of a root 41 and a tip 42, and the root 41 and the tip 42 are connected via a flange 43. Thus, the tip 42 can be easily replaced. FIG. 12 shows a state in which the cover 40 on one side of the air main pipe 22 is opened and the accumulated dust is dropped. Industrial applicability

The ventilation type rotary dryer of the present invention has a large amount of processing for the volume of the rotating cylinder, and has twice or more the capacity and high thermal efficiency as compared with the conventional rotary dryer, so that fertilizer, resin, etc. Suitable for heating, drying and cooling of mineral products such as chemicals, coal, coke, sand, wet ore, slag, and agricultural products such as grain and sugar.

Claims

The scope of the claims

1. Inlet and outlet boxes (11, 12), a cylinder (10) whose both ends are airtightly and rotatably fitted in the inlet and outlet boxes, and a raw material input device (14) provided in the inlet box A processing material discharge port (15) and an exhaust port (16) provided in the outlet box; and an air pipe (21) extending from the outlet box through the cylinder in the axial direction to the inlet box. A branch pipe (27) branching obliquely downward from the air pipe and opening the pipe end near the inner peripheral surface of the cylinder; and circular openings (32, 34) which are the inlet and outlet end faces of the cylinder. A vented rotary dryer provided with inlet and outlet side t-cut plates (31, 33) provided with: an air pipe (21) in the cylinder 10 having a plurality of axially continuous main pipes; (22, 23, 24), and the diameter of the main pipe is the exit at the entrance side Ventilation rotary drier, characterized that it has been set to be smaller than the ones in.

2. Adjacent main pipes (22, 23, 24) are connected via flanges (25, 26), and at least one of the bolt holes (37) of the flanges is a slot extending in the circumferential direction. The ventilation type rotary dryer according to claim 1, wherein

3. The ventilation type according to claim 1, wherein the main pipe (24) on the most inlet side passing through the circular opening (32) of the inlet-side partition plate (31) is eccentric to reduce the inner diameter of the circular opening. Tumble dryer.

4. The ventilation type rotary dryer according to claim 1, wherein the plurality of branch pipes (27) are arranged so that their angular positions with respect to the axis of the main pipe are shifted.

5. Each branch pipe (27) is composed of a root (41) and a tip (42), and the root is connected to the main pipe and the tip is connected to the root via a joint (43). 2. The ventilated tumble dryer according to claim 1, wherein:

6. The ventilated rotary dryer according to claim 1, characterized in that an openable cover (40) having a hinge is provided on at least one side of an upper half of the main pipe (22, 23, 24).

7. The outlet-side partition plate (33) of the cylinder 10 is composed of a plate-shaped louver (35) arranged at regular intervals in the circumferential direction, and the louver reverses the raw material that has reached the outlet-side partition plate. 2. The ventilation type rotary dryer according to claim 1, wherein the outer end side in the cylindrical axis direction is inclined so as to advance in the rotation direction of the cylinder (10) with respect to the inner end side.

8. A plurality of spoons or box-shaped flies (36) are provided on the inner peripheral surface of the cylinder (10) inside the outlet-side partition plate (33). The outlet box (12) or the air main pipe (24) Receiving plate from which the flight picks up material from the bottom of the circle (10) and drops it from the ceiling and drops it into the exit box (12)

The ventilated tumble dryer according to claim 1, wherein (39) is attached.